[Geomoose-users] Scalebar measurement in Demo

[James Klassen]

The scalebars are generated by MapServer and the measure tool is done
within GeoMoose.

I know GeoMoose does some trickery to get semi-accurate measurements in the
awfulness that is the web-merc (3857) projection.

It looks like MapServer is using the web-merc coordinates directly as
"meters" to generate the scalebar.

I am not sure if anything can be done to resolve this short of using an
appropriate local projection (and thus sacrificing compatibility with the
web-merc based tile sets).

On Dec 14, 2016 11:09, "Kevin Grootendorst" <kgrootendorst at gmail.com> wrote:

> Dear users,
> I noticed in the v2.9 demo that the scalebars are not accurate.
> I measured a line (red line in graphic) adjacent to the scalebar and found
> a difference in length (~462ft measured vs ~640ft on the scalebar).  What
> is the reason for this? Projection issue?
>
> [image: Inline image 1][image: Inline image 2]
>
> Cheers,
> Kevin
>
> _______________________________________________
> Geomoose-users mailing list
> Geomoose-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/geomoose-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/geomoose-users/attachments/20161214/cb447392/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 7927 bytes
Desc: not available
URL: <http://lists.osgeo.org/pipermail/geomoose-users/attachments/20161214/cb447392/attachment-0002.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 6071 bytes
Desc: not available
URL: <http://lists.osgeo.org/pipermail/geomoose-users/attachments/20161214/cb447392/attachment-0003.png>